Stitch scissors



Patented Fel). 2, 1937 UNTED STATES PATENT OFFICE Claims.

This invention relates to a surgeons improved stitch scissors, and has for its object, broadly, to provide detachable blades for one of the leverarms. The invention also includes a change in the cutting edge and form of the pick-up leverarm of the scissors.

Since the material used in the manufacture of stitch scissors must consist of high grade, expensive steel, and since these scissors lare useless as soon as the cutting edges lose their sharpness, it is considered that the present invention will prove to be of advantage on account of economy in production and greater utility.

The invention consists of the new and useful construction, combination and arrangement of parts as described herein and claimed, and as illustrated in the accompanying drawing, it being understood that I may make changes in form, size, proportions of parts and minor details of construction as found to be of advantage, said changes being within the scope of the invention as claimed.

In the drawing, Fig. l is a side view of the device, the blades being in closed position, and Fig.

2 is a similar view, the blades of the scissors being separated.

Fig. 3 is a top plan view of parts shown in Figs. 1 and 2.

Figs. 4-10 illustrate details of construction.

Fig. 4 is a side View showing the end-portions of the pair of lever-arms of the stitch scissors, and Fig. 5 is a plan View of one of the arms of said pair.

Fig. 6 is a plan view of the detachable blade,

and Fig. 7 is a side view of the same.

Fig. 8 is a plan View showing an end-portion of the stitch-lifter, and Fig. 9 is 4a side view of the same.

Fig. l0 is a sectional view on line Ill- I0 of Fig. 9.

Referring now to the drawing for a more particular description, the two lever-arms of the scissors are respectively indicated at 8 and 9, the pivotal connection of said arms being indicated at I0.

Numeral II indicates a distal end-portion of the lever-arm 8, operating as a supporing element and provided on its inner side with an anchor-lug, consisting of an approximately rectangular body I2, provided with a comparatively narrow guide-strip I2 disposed in line with the longitudinal axis of the part I2. Said end-portion II is provided, transversely, with a ledge I3.

The lever-arm 9 is provided with an end-portion I4 preferably rectangular in cross-section to (Cl. 12S- 318) provide, longitudinally, a rectilinear sharp edge I5 (Fig. '7), said end-portion being of tapered and curved form as indicated at I6, the terminal of said curved part I6 being of tapered and cylindrical form as indicated at I'I. 5 rIhis cylindrical part Il has a very limited length and is of such proportions that it will readily enter beneathA the thread or strand of the stitch without disturbing the skin or wound.

Numeral i8 indicates a demountable attenuated 10 blade having a sharp rectilinear edge I9 and a longitudinally curved sharp edge 2G, best shown in Fig. 5 of the drawing, said blade being provided with an aperture of rectangular form andra narrow `aperture opening thereon indicated, respecl5 tively, at 2l and 2I, the rear end of said blade having a straight edge 22. Y

As thus described it will be seen that blades I8 of high grade material may be manufactured at a limited cost as compared to the product here- 20 tofore produced. 'Ihe apertures 2I and 2|"correspond to the outline and are adapted to receive the anchor-lug I2 and guide-lug-strip I2.

If desired, a notch or slot 23 may be used and disposed beneath the ledge I3 for receiving thev 25 end 22 of the attenuated blade.

In operation, to mount the blade I8 in operative position, it may have a sliding movement on the inner side of the end-portion II of the leverarm 8, and its larger opening 2I will readily re- 30 ceive the guide-strip or lesser lug I2', and a further sliding movement of the blade will permit the larger opening 2| to receive the larger part I2 of the anchor-lug to enter the larger opening 2I of said blade, the en-d 22 of the blade entering the 35 slot or groove 23, and thereafter this blade will be firmly held in operative position.

Since the anchor-lug has a projection corresponding to the thickness of the blade I8 its surface will be disposed ush with the exposed sur- 40 face of said blade I8 to permit said blade to cooperate with the parts I4 and I6 of the lever-'arm 9 during operation.

Numeral 24 indicates a small recess which is 45 provided for the end-portion I I of lever-arm 8 for convenient use when detaching the blade.

I claim as my invention:-

l. A stitch scissors comprising a lever-arm having an end-portion provided with a ledge, a 50 groove in the ledge and an anchor-lug, a second lever-arm pivotally attached to the first named arm and having a sharp edge with a longitudinally curved end-portion with a cylindrical tapered terminal, and an attenuated blade having 55 a sharp edge with a longitudinally curved endportion conforming to the curvature of the endportion of said second lever-arm and having an aperture conforming to the contour and adapted to receive theA anchor-lug of the first named lever-arm., said groove receiving that end of the blade opposite its curved end-portion.

2. A stitch scissors including a lever-arm having an end-portion provided on its inner side with a. ledge, a groove in the ledge, an approximately rectangular anchor-lug and a guide-strip extending therefrom in line With the longitudinal axis thereof, a second lever-arm pivotally attached to the irst named lever-armV and having Va sharp edge with a longitudinally curved end-portion with a cylindrical, tapered terminal, and an attenuated blade having a sharp-edge with a longitudinally curved end-portion conforming to the curvature of the end-portion of said second leverarm and having an aperture conforming to the shape and adapted to receive the anchor-lug and guide-strip of the first named lever-arm, said groove receiving that end of the blade opposite its curved end-portion.

3. A stitch scissors including a lever-arm having an end-portion provided with a ledge, a groove in the ledge and an anchor-lug, a second lever-arm pivotally mountedY on the rst named klever-arm and having a rectilinear sharp-edge land a curved end-portion of tapered form provided with a sharp-edge with a terminal of cylindrical form, and an attenuated blade having a rectilinear sharp-edge and a curved end-portion having a sharp-edge conforming to the curvature of the end-portion of the second lever-arm, and

adjacent to said ledge, a second lever-arm.

pivotally mounted on the rst named lever-arm and having a rectilinear part and a curved endportion each provided with a sharp-edge, and an attenuated blade having a rectilinear sharp-edge and an end-portion having a longitudinally curved sharp-edge corresponding to the curvature of the end-portion of the second lever-arm, said blade being provided with an aperture conforming to the shape of said anchor-lug and adapted to be disposed with its end engaging in said groove, its aperture receiving said anchor-lug.

5.-A stitch scissors including a lever-arm having an end-portion provided with a ledge, a groovein the ledge, an anchor-lug and a guidestrip extending therefrom, a second lever-arm pivotally mounted on the rst named arm and having a rectilinear part and a curved terminal part each part being of rectangular form in crosssection to provide a sharp-edge, and an attenuated blade having a rectilinear sharp-edge and an end-portion having a longitudinally curved sharp-edge'corresponding to the curvature of the terminal of the second lever-arm, and having an aperture corresponding and adapted to receive said anchor-lug and guide-strip, said groove receiving an end of s-aid blade.

FREDRIC L. WILSON. 

